---
product_id: 734025921
title: "Oura Ring 4 - Black - Size 8 - Smart Ring - Unique Sizing, Not Standard US Ring Sizes - Size First - Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days of Battery Life"
brand: "oura"
price: "$U295"
currency: UYU
in_stock: false
url: https://www.desertcart.uy/products/734025921-oura-ring-4-black-size-8-smart-ring-unique-sizing
store_origin: UY
region: Uruguay
---

# Up to 8 days battery life Water resistant for active lifestyles Seamless smartphone app integration Oura Ring 4 - Black - Size 8 - Smart Ring - Unique Sizing, Not Standard US Ring Sizes - Size First - Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days of Battery Life

**Brand:** oura
**Price:** $U295
**Availability:** ❌ Out of Stock

## Summary

> 💍 Own your health journey with the sleek, smart Oura Ring 4.

## Quick Answers

- **What is this?** Oura Ring 4 - Black - Size 8 - Smart Ring - Unique Sizing, Not Standard US Ring Sizes - Size First - Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days of Battery Life by oura
- **How much does it cost?** $U295 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.uy](https://www.desertcart.uy/products/734025921-oura-ring-4-black-size-8-smart-ring-unique-sizing)

## Best For

- oura enthusiasts

## Why This Product

- Trusted oura brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Tailored Fit, Unique You:** Custom sizing ensures a perfect fit—because your ring should be as unique as your lifestyle.
- • **Smart Sync for Smarter You:** Effortlessly connect to your smartphone for real-time insights and personalized wellness coaching.
- • **Dive Into Data, Not Worries:** Water resistant design means your Oura Ring 4 keeps up whether you're at the gym or caught in the rain.
- • **Your Health, Digitally Elevated:** Advanced sensors track heart rate, sleep, and fitness metrics with clinical-grade precision.
- • **All-Day Power, All-Week Confidence:** Stay unplugged with up to 8 days of battery life—because your health never takes a break.

## Overview

The Oura Ring 4 is a cutting-edge smart ring designed for professionals who demand precision health tracking and seamless integration. Featuring up to 8 days of battery life, water resistance, and advanced biometric sensors, it delivers continuous insights on sleep, heart rate, and fitness. Its proprietary app syncs effortlessly with smartphones, while unique sizing guarantees a perfect fit for every user.

## Description

Full description not available

## Features

- Advanced Health Tracking, Long Battery Life, Water Resistant, App Integration

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | OURA |
| Manufacturer | Oura |
| Model | JZ90-54144-08 |
| Model Name | Oura Ring 4 |
| Product Dimensions | 2.5 x 2.5 x 0.7 cm; 181 g |
| Batteries | 1 Lithium Polymer batteries required. (included) |
| Item model number | JZ90-54144-08 |
| Operating System | Proprietary Operating System |
| Compatible Devices | Smartphone |
| Special Features | Advanced Health Tracking, Long Battery Life, Water Resistant, App Integration |
| Mounting Hardware | Oura Ring 4, Oura Ring 4 Charger, USB Cable, Information Booklet, Quick Start Guide |
| Number of items | 1 |
| Display Type | No Display |
| Batteries Included | Yes |
| Batteries Required | Yes |
| Battery cell composition | Lithium Polymer |
| Wireless Type | Bluetooth |
| Connector Type | Bluetooth, Wi-Fi, Proprietary Wireless Protocol |
| Device interface - primary | Unknown |
| Includes Rechargeable Battery | Yes |
| Manufacturer | Oura |
| Item Weight | 181 g |

## Product Details

- **Operating System:** Proprietary Operating System
- **Special Feature:** Advanced Health Tracking, Long Battery Life, Water Resistant, App Integration
- **Connectivity Technology:** Bluetooth, Wi-Fi, Proprietary Wireless Protocol
- **Wireless Communication Standard:** Bluetooth
- **Battery Cell Composition:** Lithium Polymer

## Images

![Oura Ring 4 - Black - Size 8 - Smart Ring - Unique Sizing, Not Standard US Ring Sizes - Size First - Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days of Battery Life - Image 1](https://m.media-amazon.com/images/I/51nCNxSwfYL.jpg)
![Oura Ring 4 - Black - Size 8 - Smart Ring - Unique Sizing, Not Standard US Ring Sizes - Size First - Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days of Battery Life - Image 2](https://m.media-amazon.com/images/I/51QDuTKnNyL.jpg)
![Oura Ring 4 - Black - Size 8 - Smart Ring - Unique Sizing, Not Standard US Ring Sizes - Size First - Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days of Battery Life - Image 3](https://m.media-amazon.com/images/I/71DVlVFg1RL.jpg)
![Oura Ring 4 - Black - Size 8 - Smart Ring - Unique Sizing, Not Standard US Ring Sizes - Size First - Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days of Battery Life - Image 4](https://m.media-amazon.com/images/I/713l574H8CL.jpg)
![Oura Ring 4 - Black - Size 8 - Smart Ring - Unique Sizing, Not Standard US Ring Sizes - Size First - Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days of Battery Life - Image 5](https://m.media-amazon.com/images/I/71NT8fo7vNL.jpg)

## Available Options

This product comes in different **Colour, Size** options.

## Questions & Answers

**Q: How long should my ring work between charges?**
A: Oura Ring 4 typically lasts 5-8 days on a full charge, depending on usage. Contact Oura Member Care if you have questions or concerns with battery life, and they will ensure your problem is resolved

**Q: How do I choose the right Oura Ring size?**
A: Using the Oura Ring 4 Sizing Kit, choose a finger for your ring. We recommend the index, middle or ring finger. Wear the sizer ring for 24 hours to ensure the fit is secure and comfortable over the course of your day.

**Q: What's included?**
A: Oura Ring 4, Oura Ring 4 Charger, and USB-C Cable.

**Q: How do I see my Oura Ring metrics?**
A: After activating your Oura Ring, you can choose a monthly or annual membership to unlock full access to Oura’s features, daily health and wellness metrics, and personalized guidance.

**Q: Can I use more than one ring?**
A: Oura Members can now connect more than one Oura Ring 4 to their Oura App and quickly switch between them. Note, this feature only supports wearing and syncing data from one active Oura Ring at a time.

## Frequently Bought Together

- Oura Ring 4 - Black - Size 8 - Smart Ring - Size First with Oura Ring 4 Sizing Kit - Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days of Battery Life
- sylacor Ring Cover for Oura Ring Gen 4/ Gen 3, Anti-Scratch Elastic Silicone Oura Ring Case Protector for Men Women Working Out Gym

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*Product available on Desertcart Uruguay*
*Store origin: UY*
*Last updated: 2026-01-23*